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c#调节笔记本显示器亮度的代码

Admin | 2014-9-22 10:35:46 | 被阅次数 | 2698

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;//必须引用此项


namespace WindowsApplication1
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            SetGamma(trackBar1.Value);
        }
        [DllImport("gdi32.dll")]
        public static extern int GetDeviceGammaRamp(IntPtr hDC, ref RAMP lpRamp);
        RAMP ramp = new RAMP();

        [DllImport("gdi32.dll")]
        public static extern int SetDeviceGammaRamp(IntPtr hDC, ref RAMP lpRamp);

        [DllImport("user32.dll")]
        static extern IntPtr GetDC(IntPtr hWnd);

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
        public struct RAMP
        {
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
            public UInt16[] Red;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
            public UInt16[] Green;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
            public UInt16[] Blue;
        }
        void SetGamma(int gamma)
        {
            ramp.Red = new ushort[256];
            ramp.Green = new ushort[256];
            ramp.Blue = new ushort[256];

            for (int i = 1; i < 256; i++)
            {
                // gamma 必须在3和44之间
                ramp.Red[i] = ramp.Green[i] = ramp.Blue[i] = (ushort)(Math.Min(65535, Math.Max(0, Math.Pow((i + 1) / 256.0, gamma * 0.1) * 65535 + 0.5)));
            }
            SetDeviceGammaRamp(GetDC(IntPtr.Zero), ref ramp);
        }

    }
}